#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>
using namespace std;
#define M 1000900
typedef long long ll;
char s[M];
int main()
{
    ios::sync_with_stdio(false);
    ll T;
    cin >> T;
    while(T--)
    {
        ll m,n;
        cin >> m >> n;
        ll k = 0;
        while(n > 0)
        {
            s[k++] = n%3;
            n /= 3;
        }
        for(ll i = m-1;i >= 0;i--)
        {
            if(i >= k) cout << 'R';
            else
            {
                if(s[i] == 1) cout << 'G';
                if(s[i] == 0) cout << 'R';
                if(s[i] == 2) cout << 'B';
            }
        }
        cout << endl;
    }
    return 0;
}